@misc{Pietrzak_Michał_Changes_2016,
 author={Pietrzak, Michał and Iskra, Janusz},
 type={artykuł},
 publisher={Projack},
 title={Changes in women’s 400 m hurdle run from 1978 to 2014},
 address={Częstochowa},
 year={2016},
 language={eng},
}